Oh, i somehow managed to unlock everything in the last map, there are like 2 or 3 enemis below those (one being a boss, but the game didn't care, got to the finish without killing it and got the 3 stars), and the 2 middle bottom nodes have the panels that open the gate to the final boss and the pest gate, which hopefully they didn't trigger.

And acccording to japanese wiki, if i'm not wrong since the picture is broken, there should be only 3 locked tiles with a random arrow and the 2 panels, so they have really fucked up this map.